Certain files are not used by the system, so that loopback mounting
them has no effect. For example, the /etc/dfs/dfstab file
in a labeled zone is not checked by Trusted Extensions software. For more information,
see Sharing Files From a Labeled Zone.

Start the zone.

# zoneadm -z zone-name boot

Example 10–3 Loopback Mounting the /etc/passwd file

In this example, the security administrator wants to enable testers
and programmers to check that their local passwords are set. After the sandbox zone is halted, it is configured to loopback mount the passwd file. Then, the zone is restarted.